JAIPONG, P.; TAPANYO, W. Connectivity of Suborbital Graphs for the Congruence Subgroups of the Extended Modular Group. Communications in Mathematics and Applications, [S. l.], v. 8, n. 3, p. 345–358, 2017. DOI: 10.26713/cma.v8i3.549. Disponível em: http://www.rgnpublications.com/journals/index.php/cma/article/view/549. Acesso em: 2 may. 2024.